Guard mechanism for punch-presses.



O. KARTZMARK,

GUARD MECHANISM FOR PUNCH PRBSSES.

APPLIOATION FILED $EPf1.15,1911.

1,086,059. Patented Feb.3,.1914.

- 2 EHEBTS-SHEET 1.

Inventof 0. KARTZMARK.

GU'ARD MEUHANISMFOR PUNCH PRES-SE5.

APPLICATION FILED SEPT. 15,1911.

Patented Feb. 3, 1914.

2 SHEETS-SHEET 2.

. .Aitameyt have invented certain s'ra r OTTO KARTZMARK, OF NEW- YORK, N. Y.

GUARD MECHANISM FOR BUNCIii-PRESSES} Specification of Letters Patent.

Patented see. a, 19114.

Application filed September 15, 1911. Serial No. 649,492.

Be it known that I, Own) KAR'rzMnnK, a citizen of the UnitedStates, residing. in the borough of Brooklyn, cityof New York, county of Kings, and State of New York,

provements in Guard Mechanisms for Punch-Presses, of which the following is a specification.

Broadly considered, my invention relates to devices for safe-guarding operators from injury by machinery. It is, however, part-icularlyfadapted for use in connection with punch presses, and it will be described in.

that connection.

The general object, of my invention is to provide a new and improved guard mechanism which can readily be applied to a. punch press, and which will so limit the operation of the press that it is impossible for the operator to bring the dies together while his hand is between the dies, or in any other dangerous position.

In most punch presses, the controlling device by which movement of the reciprocating member is re ulated is connected to an actuating'lever which is often arranged for operation by the foot of the workman. Although my invention is not limited to use with such presses, it is particularly adapted for them, since its working parts caneasily be inter? posed in the connection between the controlling device and the actuatin lever.

My inventi and its many advantages will appear from the following description of one embodiment thereof, taken in connection with the accompanying drawing, in whichelevation ofthe bracket or base upon which the movable elements in the guard mechanism are supported; Fig. 5 shows the rotatable member which carries the guard; Fig. 6 shorts the rotatable member which cooperateswith the'member shown in Fig. 5; Fig. 7 shows a lever operated by the member shown in Fig. 6; Fig. 8 is a. section on the new and useful 1m 'cated at 18, mounted upon a. shaft 19 on will be fully understood,

line 5-8 at Fig. 6, but with the holding bolt inplace; Fig. 9 is a front elevation showing an adjustable connection employed with my ard mechanism' Fig. 10 is a. section (in ti Like parts are referred to throughout the several views by the same reference characters.

The pres illustrated in the drawings is of a well-known form having two supporting standards 15 upon which is mounted the body 16 of-thepress. This body is adjustable in a well-known permit the bed plate 17 shown. The fly-wheel of the press is indie naled in the top of the body 16. The rocating element of. the press is indicated at 20, and carries a die member 21 which 00' operates with the die member 22 secured to the bed plate 17 of the press.

The driving connection between the reciprocat-ing element 20 and the shaft 19 is not shown, but is to .be understood as of any well-known form controlled'by the operator in a well-known manner. For the present purposes, it is only necessary to say that the starting and stopping of the reciprocatdine l0-10 of Fig. 9, and Fig. 11 is a sectlon on the line 11-11 of Fig. 9.

manner, in order to I of the press to be. used either horizontally or inclined, as

jour-I recip ing element of the press is effected through the medium of arod 25 connected to a latch member 26 forming part of the controlling mechanism. The lever 26 is shown in Fig. 3, and it is to be understood that when said lever is in the position shown in full lines,

the fly-wheel 18 revolves without causing movement of the reciprocating element of the press; and that-when said lever 26 is in the position shown in dotted lines, the connection between the fiy-wheel 18 and the reciprocating member of the press becomes effective and the operationof the press takes place. Ordinarily, the rod 25 extends downwardly to a lever 28 pivoted at 29 in the frame 15, and the workman controls the operation of the press by moving the lever 28 with his foot.

- What has been described up to this point is a well-known form of press. I will-now proceed to describe my new and improved guard mechanism, and the manner in-which the same is applied to a press of the type just described. It will, however, be understood that my invention is equally applicable to other styles of press, with only slight modifications such as will be obvious to those skilled in this art.

The moving elements of my guard mechanism are interposed in the connection between the actuating lever 28 and the lever 26 of the controlling mechanism. In order that my guard mechanism may be easily applied to the press, I provide a-base or bracket, shown particularly in Figs. 3 and 4. This base may be of any suitable form, and as shown, comprises a circular portion 36, from which extends an arm 37 having "herein holes 38 through which bolts may e passed to secure the base to the'press. Extending from the middle of the circular portion 36 of the base is a perpendicular. stud 40 upon which the movable members 46 and 65 of the guard mechanism are pivotally supported, as hereafter described. The base carries a perpendicular lug 41 which extends a distance about equal to the thickness of the member 46, shown in Fig. 5, hereinafter described; and a perpendicular lug 42 extends outwardly from the arm 37, as shown. Extending from the round portion 36 is a radial arm 43 carrying a perpendicular stud 44 upon which the bell crank lever 72 shown in Fig.,7 is pivotally supported, as hereafter described. Supported on the stud 40 of the base is a member 46 of the form best shown in Fig. 5. This member 46 has a radial projecting socket 91, in which lies a bar 47 which is rigidly secured to the socket by bolts 48 which pass through holes 49 in such socket (see Fig. 1). These bolts have shoulders, as shown in Fig. 8. The guard proper maybe of any suitable form, and, as shown in Figs. 1 and 3, comprises a U-shaped guard member 52 sup-- ported at about its middle by a bracket 53 which is secured to the end of the bar 54. As shown in Fig. 2 the bar 54 has one edge notched or toothed. This bar passes through a clamp 55. A channel bar 56 also asses through the clamp at right angles to the bar 54. The clamp is provided with a screw 57 by means of which the teeth on the bar 54 are forced against the channel bar 56, thereby producing a rigid connec tion between the bars and 56, while at the same time permitting adjustment of either of said bars longitudinally in the clamp. The channel bar 56 is connected to the. bar 47 by means of a clamp 58 adjustable on the bar 47 in a manner obvious from Fig. 1. Of course, the construction of the guard, as just described, may be modified in many respects, and I have described it thus particularly merely because I believe that the arrangement which I have shown is a highly satisfactory one. since. while it permits ad- 'prises two and 83, which are connected together by justment of the guard member 52 in three,

directions, it still holds it firmly in position while the press is in operation. Referring to Figs. 4 and one direction by the engagement of the shoulder 60 against the lug 41; and in'the other direction by the engagement of an ad justable screw 61 against the lug 42. The screw 61 passes through a radial lug on the round portion of the member 46, and said screw may be locked in position by a locknut 62.

Mounted on the stud 40 outside of the member 46,- is a. member 65', of the form best shown in Fig. 6. At one end, the member 65 is'provided with a radial extension 92 with a recess 93 which covers the end of the bar 47. This extension 92 is wider than thebar 47 and is provided with slots 66 through which pass the shoulders on the bolts 48 which secure thebar 47 to the member 46. The radial projection of the member 65 is yieldingly maintained with reference to the radial position of the bar 47 and the member 46, by means of a leaf 5; the rotary movement of the member 46 is limited in:

spring 67 arranged at one sideof the bar 47 .in the recess 93 of the member 65, as shown in Fig. 6. The member 65 has a radial lug 69, in which is mounted-a perpendicular pin 70, which engages with a cam slot 71 in a bell orank lever 72, shown This bell crank lever 72 is pivthe stud 44 which exin Fig. 7. otally supported on tends from the base'into the hole 73 in said bell crank lever. The member-65 is also provided with an extension 75, to which, by means of a hook 76 is secured a spring 77 which is connected to a pin 78 on the press frame. The spring 77 tends .to hold the parts of the guard mechanism in the position shown in full lines in Fig. 1. The rod 25, leading to the controlling mechanism of the press, is pivotally connected to the lever 72 by means of a pin passing through a hole 80, as shown in Figs. 1 and 7. A rod 81 leads to the actuating lever 28 and is pivotally connected to the member 65 by a pin which passes through a hole 82 in a lug extending from the side of the extension 92, as shown in Fig. 1. The members 46 and 65 are held in position on the stud 40, by means of a nut 94.

In order to permit adjustability of the bed of the press upon its standards, the connection between the actuating lever 28 and the member 65 must be adjustable; and in Figs. 1, 9, 10 and 11 I have illustrated an adjustable connection which I have found to be very satisfactory. This connection comparallel screw threaded rods 81 the device shown im Figs. 9, 10 and 11. This device comprises a nut 88 oir-the rod thereby binding the screw the same tightly in the nuts. 30

- portion of its side removed, which will expose a portion of the threads of the rod passing through that nut, and each nuthas a tongue 95 adapted to fill the cut-away portion in the other nut and 'is threaded so as to engage the threads on the rod passing through that other nut, as clearly shown in F lgs. 9, 10 and 11. With this arrangement, it is obvious that when the screw 90 is removed, the nuts 87 and 88 may each be independently screwed back and forth, each on its own rod, until said nuts are properly located to give the desired length of connection between the lever 28 and the member 65. brought together and the screw 90 inserted. Upon tightening up on the screw 90, the tongue of each nut is drawn into the cutaway portion of the other nut, and engages with the exposed portion of the threads on the rod carrying the other nut, an action which will tend to throw the screw holes in the nuts out of alinement with one another, 90 and holding It is obvious that the construction of connection just describedis a highly advantageous one in the service to which it is put, since it will not give way or shake loose under the severe jarring to which it ation of the press.

The relations of the lug 41 tothe shoulder 60, and of the pin 70 to the cam'slot 71, are such that, until the shoulder 60 has come into engagement with the lug 41 which is caused by the simultaneous rotation of the members 46 and 65, the pin 70 will move in a that portion of the slot 71 which is concentrio with the stud 40 upon which the member is pivoted; at this point the member 46 canrotate no further, owing to the engagement of the shoulder 60 with the lug 41; and it is only by the further movement of the member 65 with reference to the member 46 which is permitted by the nature of the connection bet-ween these members, that the pin is enabled to engage with the bottom portion of the cam slot 71 and move the lever 7 2. The guard 52 should be so set that it is substantially in engagement with the bed 17 of the press When the shoulder 60 of the member 46 is in engagement with the lug 41. If the guard 52 is stopped before it reaches the bed, then the lever 72 will not be moved by engagement of the pin 70 with the bottom part of the cam slot 71 and the-bell crank lever will not be turned upon its pivot until the guard 52 has reached the bed'ofthe press. That i's,-if the hand of the operator .or anything else prevents l The nuts. are then is subjected in the operthe guard from moving into engagement with the bed of the press, the movement of the member 65 with reference to the member 4.6 will take place before the pin 70 has reached the portion of the cam slot 71 at which the pin is effective to move the lever 72, and the press will not be operated. In other words,,-the press cannot be actuated by the lever 28 unless the guard 52 is free to move into engagement with the bed of the press, which means that itis safe for the press to operate without injury to the operator. v always remain in guarding position until the member 65 has moved rock the lever 72 and throw the controlling device of the press to stop position. The dies are, therefore, always guarded. I

The screw 61 permits adjustment of the stroke of the guard mechanism, thereby'enabling the operator to limit the movement of the lever 28 to merely whatv is necessary to move the guard satisfactorily and to operate the controlling device.

TVith some kinds of work, such as sheet punching, a guard is not as necessary for the protection of the operator as with those kinds of work which necessitatehis constantly inserting his fingers betweenthe dies. In my guard mechanism, by removing the bolt 48, the bar 47 and the whole guard can be removed, leaving a perfectly operative mechanism by which the I press can be controlled in the usual manner.

In accordance with the provisions of the patent statutes, I have described the principle of my invention, apparatus which I now consider .to represent the best embodiment thereof; but I desire to have it understood that t-he'apparatus shown is merely illustrative and that the invention can be carried out in other ways;

Having 'now described my invention, what I claim as newahd desire to secure by Letters Patent, is

1. A guard mechanism for together with the punch presses comprising a movable guard member, a movable actuating member connected to said guard member through a yielding connection, means for moving said actuating member, and a motion transmittingdevice moved by said actuating member only when the latter is moved with reference to the guard member and when said guard member is in guarding position.

2. A guard mechanism for punch presses comprising a pivoted guard member, a pivoted actuating member connected to said guard member through a yielding connection, means for moving said actuating mem-' her, and a motion transmitting device moved by said actuating member only when the latter 'isihoved with reference to the guard member when said guard member is in the same axis as said. guard member,

- guardmember IS in the guarding tuirtmgmember pivotally guarding position.

3, A- ard mechanism for punch presses comprislng a pivoted guard member, an actuating member pivotally arranged on the a yielding connection between said guard member and said actuating member,.means for moving said actuating member, and a motion transmitting device moved by said actuating member when the latter is moved with ref-. erence to the guard member and when said position; 4:. A ard mechanism for punch presses comprising a pivoted guard member, an acarranged on the 'same axis'as said guard member, a yielding connection between said guard member and said actuating member, means for moving said actuating member, and a cam connec tion between said lever and said actuating member whereby said lever is moved only when the actuating member is moved with reference to the guard member when the latter is in its guarding position.

v5. In combinationwith a punch press having an actuating lever and a controlling de vice, a pivotally supported .1nember,a guard carried thereby, another .pivotally supported member, a yielding connection between said members, a connection between said secondnamed member and said actuating lever,

' and a connection between said second-nam position of the guard.

member and the controlling device opera tive only when the first-named member is in the osition corresponding to the guarding 6. In combination with apunch press having an actuating device; a guard mechanism comprising a base, a member rotatably mounted thereon, a guard carried by said member, another member rotatably mounted on said base, a

, connection between said last-named member and the actuating lever, a yielding connection between said rotatable members, and a connection between the second-named rotatable member and the controlling device operative only when the said first-named rotatable member is in the position corresponding to the guarding position of the ard.

7. In combination with a punch press having an actuating lever and a controlling device; a guard mechanism comprising a base, a inemberrotatably mounted thereon, a guard carried by said -member, another member rotatably mounted on said base on an axis concentric with the axis of the firstnamed member, an adjustable connection between said last-named member and the ac tuating lever, a lost motion connection be tween said rotatable members, a spring tend-, ing to-hold said rotatable members in a certain position lever and a controlling with reference to one another, a lever connected to the controlling device, and a cam connection between said lever and the second-named member whereby saidlever is moved only when the second-named member is moved against'the tension of the spring with reference to the'first-named tatable member when the latter is in the position corresponding to the guarding position of the guard.

8. The combination, with the drivingmechanism of a machine, and a' guard for moving parts of the machine; of a manuallyoperable member for throwing the guard and the driving-mechanism successively into operation,

and connections between the manually-operable member and thedriving-mechanism and the ard, .said connections being adapted, durlng the first part of the operative movement of the manuallyoperable member, to 'movethe guard fully to operative position without movement of the driving-mechanism, and thereafter, during continued movement of the manna llyoperable member, to throw the drivingmechanism into operation without further movement of the guard.

9.'1n combination with a machine having driving-mechanism, and controlling-mechanism, for throwing .the driving-mechanism into operation, including a manually-operable member; a guard for moving parts of the machine, and connections between the guard and the controlling-mechanism wherev by the guard is moved tooperative position during the first part of the movement of the manually-operable member; the controllingmechanism having lost-motion-between the driving-mechanism and the manually-operable member whereby substantial of the driving-mechanism is avoided until the guard has been moved to operative posimovement tion, and the connections between the guard and thecontrolling-mechanism including. a yielding device to permit continued movement of the controlling-mechanism after the guard has been arrested in' operative position.

10. In combination with a machine having driving-mechanism, and controllingmechanism, for throwing the driving-mechanism into operation, operable member; a guard for moving parts of the machine, and connections between the guard and the controlling-mechanism ineluding yielding means for moving the,

guard to operative position during. the first part of the movement of the manually-operable member, and 3 positive means having lost-motion during said first part of the movement but adapted to prevent the further movement of the controlling-mechanism when the guard is arrested short of opera tive position; the controlling-mechanism including a'manuallyhaving 10st-motion between the driving- This specification signed and witnessed mechanism and the manually-operablemem this 13th day of September 1911.

ber whereby substantial movement of the OTTO KARTZMARKF driving-mechanism is prevented during said Witnesses: v 5 first part of themovement ofdzhe manually- 7 JOHN L. LOTBOH,

operable member. GEO. J. HANse v. 

